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Table representation of search results timeline featuring number of search results per year.
Year
Number of Results
1966
1
1967
2
1968
1
1970
2
1971
8
1972
7
1973
19
1974
199
1975
401
1976
337
1977
311
1978
327
1979
338
1980
329
1981
322
1982
354
1983
347
1984
409
1985
353
1986
390
1987
341
1988
422
1989
429
1990
395
1991
356
1992
326
1993
292
1994
313
1995
293
1996
278
1997
230
1998
248
1999
194
2000
173
2001
188
2002
190
2003
195
2004
185
2005
174
2006
205
2007
192
2008
195
2009
169
2010
138
2011
169
2012
155
2013
169
2014
137
2015
161
2016
199
2017
189
2018
169
2019
151
2020
174
2021
105
2022
16
2023
7
2024
10
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AMA
APA
MLA
NLM
Adaptive Clinical Trial
Address
Autobiography
Bibliography
Biography
Case Reports
Classical Article
Clinical Conference
Clinical Study
Clinical Trial Protocol
Clinical Trial, Phase I
Clinical Trial, Phase II
Clinical Trial, Phase III
Clinical Trial, Phase IV
Clinical Trial, Veterinary
Collected Work
Comment
Comparative Study
Congress
Consensus Development Conference
Consensus Development Conference, NIH
Controlled Clinical Trial
Corrected and Republished Article
Dataset
Dictionary
Directory
Duplicate Publication
Editorial
Electronic Supplementary Materials
English Abstract
Equivalence Trial
Evaluation Study
Expression of Concern
Festschrift
Government Publication
Guideline
Historical Article
Interactive Tutorial
Interview
Introductory Journal Article
Lecture
Legal Case
Legislation
Letter
Multicenter Study
News
Newspaper Article
Observational Study
Observational Study, Veterinary
Overall
Patient Education Handout
Periodical Index
Personal Narrative
Portrait
Practice Guideline
Pragmatic Clinical Trial
Preprint
Published Erratum
Randomized Controlled Trial, Veterinary
Research Support, American Recovery and Reinvestment Act
Research Support, N.I.H., Extramural
Research Support, N.I.H., Intramural
Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, Non-P.H.S.
Research Support, U.S. Gov't, P.H.S.
Research Support, U.S. Gov't
Retracted Publication
Retraction of Publication
Scientific Integrity Review
Technical Report
Twin Study
Validation Study
Video-Audio Media
Webcast
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